Here's a blog that states: The Arrow was a supersonic design through and through, with ‘clean’ lines to achieve high supersonic speeds and a large internal weapons bay, and although this would have allowed some multi-role capability, in a dogfight or at anything approaching low-level the Arrow airframe would’ve handled like a pig. It simply wasn’t designed for that mission. The CF-18’s we have today can deliver a variety of ordnance from all altitudes, as well as hold their own in a closein dogfight.